Ok, just for fun, I went and counted, 9 digital camera's, my circa 1980 35mm with numerous lenses 1 roll of film in the camera, 5 in the camera case, disposables in each car (7) all new, new pack of disposables in pantry in case the disposables get used (3), and every cell phone in the house with a camera (5) oh and two rolls of black and white film in the closet.
Ok I had a point when I started this, oh yeah, my family is photo-holic (back in the day before digital I averaged 1-2 rolls developed a week, DH thought I should have been in a 12 step program for photographers. I think the amount of camera's especially with an only grandchild in the house, would be more the norm, that way when she was doing something "cute" there was alway's a camera near by to take the picture.
Also, when you get film developed, you have the option of putting the pictures on CD, so you get them back in digital format.